Run pgvector-clean before pgvector-setup

What does this merge request do and why?

For some reason the pgvector compiled for PostgreSQL 13 was being installed in the PostgreSQL 14 library path:

tmp/loadable_libraries.txt failed with:

could not load library "$libdir/vector": ERROR:  incompatible library "/Users/psj/.asdf/installs/postgres/14.9/lib/vector.so": version mismatch
DETAIL:  Server is version 14, library is version 13.
In database: gitlabhq_development_embedding
In database: gitlabhq_test_embedding

To avoid this problem, run make pgvector-clean before the make pgvector-setup.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.